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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b62d8f3a1d01b708119abae055d8675771ae03267b77a9aa7b11e16e45bcb1d' 
  AND token = 'HoC/gs8Dt6LzQ4o3aS7WDgoP+FICOvVwBTOQTZtoqeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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