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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811d92bd15e6562b86170ac1a3b46cd78681cc56d08d4c3614afb7ccef73fb4f' 
  AND token = 'rcNERN6tcN0H3G/ApC3BVCOM00oHxv8w15TmvNswHO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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