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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc93f660c80b34c1d216386ad1c4e88fa0023c48fed9c20e52ceb50c2bb54acd' 
  AND token = 'u3XW3w1ceWxTgEuHjPUGiPtyfkjNte0a1NTBVeqc1pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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