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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c91098ed6cddf4818034a50caab2c0ee4d73b426c098b3776549fdd3d169a71f' 
  AND token = 'xdhKiVNWw4W/8hxyVqRK8sQoA3erATm4+JgfVa+6GD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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