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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf70f44c433b4f4a5338702e6753df4dfc4bdacd34bdf217b86ecc62ae071989' 
  AND token = 'DuH/aUsuXmv58ESo/Rh6m5P6VPqDFOOlxH1+M95dXd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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