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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb0b27c081fb5f056394ae0ce092d467de41d58a3a4282b27b92b00b28b19d3' 
  AND token = 'Hfc8Svx93Eg1z2iOLVKKLAsjN8wC5zBvISeQA2013iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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