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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287b192b963959fc8495ae451e010b0be89905c2098fde4a5d039d0c4163fd3e' 
  AND token = 'tbO7RJqJ8t/sJY5CudwXRBxPhGXmg93HfASODLqrcoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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