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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd475ee71dbc0f9ba4d2cfcd222e453b1e1cc6d47399361ee343d0a4044c67854' 
  AND token = '9G5jcxXAa9omSTXKhjOHKwX6zdrwFnVR5fq6VCrh1ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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