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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef88ffdf261fb403c6afbaf7e2a8a19715bc9a1d18084c369fec609f724f76e' 
  AND token = 'rqScOpe14K1HA90LA2qI/UojsV2XSus4q2ZCp3H+b4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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