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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00de82e301b79ca30ec30a0dfc98b942b3a4c429da677d8ede7d923dd55a45d' 
  AND token = 'ojPSuzfgdEfnrOuRDDyIT7vXDn6pZy4R/eSTiFXoYPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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