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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a4904f448218bcfb1cdebda56cf9e9638d6b59de2e22cb4df8c751b1131be7' 
  AND token = 'p+qnNKIIaf4qWl24d+JezWWXAN7dIGdN7JNojUlJTMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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