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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a40972fd5c4919360ade80326094c6807bc0577694eacc1a9cf3613b2494e9a' 
  AND token = 'hHBytBJ9ALp7etWPi+d9zCpVrSeltRlytRybpGzLB68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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