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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b615d6fbec65b2cbcc79d7714d7e0c16216ec9e3007b4bcdc98e070316fafea0' 
  AND token = '/p9cIT6kzowSOwy4eN1rrHGB3Ql+XFNHuo6zIM8YGoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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