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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc87532fec044cbb7613ac98fb8ffd3fe98e64e83c1b0fa9e48c998f2fdab37a' 
  AND token = 'wjgWGSElpoDHX7xaOXQT2O6oR/BUI1ykcQaPlHUvOsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}