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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ec493924c3cc227c487494591ec0257a7337e0b039c3f876616d2f72c78f3e' 
  AND token = 'haY5/5LItIRG9InUGFStjLJXRITKmNwUrReLRY1FAYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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