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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bacf2f5cf5b9ca0ef6acaf2b6d7baf8b64968c1c93838783c34e8bf34cbd2a6' 
  AND token = 'W8hW0Lms3X5LZ4jkAaAmyuP3dr4x7I/ELx4jPKcJmdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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