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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7386877d179f136eb34aca6d0b04d626c8f15c92a83e51d982856c46aac81e' 
  AND token = 'uKv+W590EiIZfT7L0+3E0Hdq6iHV2+GrgTvdXbmO8jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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