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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df316f834d6ecf1260fb5951d2ea6753b779e0996a369034ff67e2fd5e8cebf' 
  AND token = '+i0AGaZmnfXh93qZw1Rz16e9PZZxGPZZnq3UZa2iS2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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