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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8089d8524cb8af73b6f1796bfdf011158b9d45a00a5ae02146acf091a918bf30' 
  AND token = 'P+5ADjhQh6LKf3mFv89p71sh7a5n9CAhJjyyWRiojPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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