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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6590e362dbc87de027d9a07ba12ebcc4089e7b4e3d18f26b2c08839921c383d' 
  AND token = 'cgEExSci7wgBYj6p06w2Ng5QUo3wY4s8did6h9o9l3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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