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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31eb774a6e0151b7f1a6c6e2f187c55cda0202402bbca4c424495823d4e7221' 
  AND token = 'fV88J6c2Pm1w7QSXuB6A2H/fOhBY47iBxEiWvIH2W9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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