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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a87a6f2d30d61944283509fa6f232a4083b40c730bfc05e7590a72af4fd1ff8' 
  AND token = 'TftLdg4K/VL33SzDoH8NbTD/KAJao7cAwKo7Den4cBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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