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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b2088f354952c0d2d2a66204d6b9077b2e8b78158c972af73f4b0f062da899' 
  AND token = 'tsMDFeGmryY9ESc/ea8A/YygqcnMvi191GEz1eQSfos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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