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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1969e9c291f9df11c2973744cb5ef0c5f0e01a9eff466f6e5ba25b89999b4cc2' 
  AND token = 'qdxqpMTlukfuRQox1mqQ5B21gQ/Nadm7ksh9vEq6rcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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