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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ec6be9fe8b604c3dc3fc0de7bd31fbff8de6233d4ec9f8d740f2c8d3c6be26' 
  AND token = 'eGiQ+F+nPPuWDGmksy0ay+dCe+t0QkYtm6csy6Ze5Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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