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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcddfc30db9701edac501a72c6daea825aef4e91a68b902279eb44d0581c16e2' 
  AND token = 'GkDH81Xz/fxukNHeh3Dw9Q2eX2K8odooMxvMKPoZcCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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