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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a1c5d03dfb96985dda5d5d33524c8fd8b59a6cf61204a65d33500e7587ac67' 
  AND token = 'aUpDhY5hIs2OolvvSkSrbDqHf8qh27zWaytKTr9hzdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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