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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0876d275bc914ead1ba45b0063b9e563bdaf52d0a0cfd8832e62304e44b9ee31' 
  AND token = 'LjZnPqOxCu29X48PavfTfw2Vi5xBXPVXggZqCqCQxWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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