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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c55b36f339857d5e6f04c3c033f42712a8dec97de104ffb7c7422bbe7dd33be4' 
  AND token = 'vqm0vfeaJQEg0Vu3cFEFMbnyuMInEPqCqNljmD0eD8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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