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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bb4bad46c5201b7ea23ccbb711fe74740e2047718e7156033678a3b0ee6db4' 
  AND token = 'cj9ltE9rN1QO1yBSpTqwPt7mReO4gNiYUWLZUhP2OuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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