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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9603166930cc2bb738c8b0eaa93ae1c9888634260fd78682afac07eb5a2fa4' 
  AND token = 'uZqF8Za92roY78hNNtM/SthSdPOLDg/0XV7agQVu0Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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