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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c8fd213cf239be3afa70c4ece57e0184b46d374fa525041bdecea9b659f88b' 
  AND token = '2h1+5ijy9af9d7NtI/6oeE/k6zqqhf9egSgtTDvvlP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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