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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40b37a63eb4049209f69d2d36e45e918798ed0f20a7073d1ef9ab8d234cf5d0' 
  AND token = '60J9zYjdhG2QwRnCRdgoxfMFoMm3Qj3muQVIY5PP5CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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