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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1046bb71e89a4c68c6bb1a065a39304a22691c6e912aa4a0efeb2717c465315' 
  AND token = 'Nehk9ZvTFImkX4HIJhyqSh0vjA6ZK8fuhKam7vH1cr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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