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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175ffd24c4bfc30de3f9e1e02bc24dc0c84cb28506a2f14f5c451e1528fba001' 
  AND token = 'Z4KMYZTslol/F1O/WadnwXK0K7N66Fr5SlhOoxlXNU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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