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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e61109a57cd465e60ca0ff474f5a08882801dd919ad505fb5fdd3643a63abe' 
  AND token = '9lCPwCSYfu03xY5s8Kaf6GsIHMoUEpviyDI7RqtwdM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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