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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b24f90b08d42120b8304b010be9ced7c5f99dcfd20b1490f7a17aee529d3e7' 
  AND token = '9aTddDjcNlGwgGgDZx3Q28EcqILom6tBCkZaoSXiQZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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