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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb640d46c45812379d5629c717345bd061d5bb23251432d8cb9f424eff2c86f' 
  AND token = 'eA1L6Qf2ou1Z1/XzewvjEvKs0cQcJMvSACnXQdrKcm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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