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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c742a431f09a0cc3c6bd402f1d6ff94d8e906ca69dc30d43020fb8be73b2c5bf' 
  AND token = 'NCskFEMomtkDRjILJMaYJ1z6DBP2HSIympNuhmRkwWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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