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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daeaa510b978c58c34b7b573a7b57f603834a12ecb28cdca33c7cef006b19876' 
  AND token = 'NZkgOAAqrnUpeBBx38A+6Baiqrg3sOYBWcY8uJrjpQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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