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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df2365d57945ba78b6b0ac5e26afdb30933813993c0c18905d2e161cca756f30' 
  AND token = 'vSlawKDiAjtzVN8drHSKWwsd8Jrr3uyVzSdjhQ0EoEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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