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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3c2f4e04d1221c954b2615d494e474b43c04426ca2ca08e42af4b4fdb97ac0' 
  AND token = 'oYrA5ovhmurqDIo8nYqoy6xjllZYk9t/xjm6btpTc40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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