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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5a6867baffd014952431cbd82c4abe2a95b7495ae1f06b26d4864fa1c39f74e' 
  AND token = 'kmRXBBNaU9jOoxfbG+RRC5dBl3bWTABuErjwdJXRRwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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