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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd49f9b37b91d23a82764264c945cf89222bc699c176f530fc654a62adc7db0d7' 
  AND token = 'L0rtEJ48qE5bwtC65CnTqlNTwAAOb19rVBZ7LMz71OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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