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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d731fc2d2462de4db6f8edd9827bfb4a08289e733027ef102d1ea07553b1d0' 
  AND token = 'tT9TnomvDU3oiFpa/LiUsALXvM1+ZHXo6iauesCJl04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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