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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25497e98de80a5976555f9b358e4c7aadb57b03a15bd872f0127f4c7e7ac215a' 
  AND token = 'mE95OknXxA048jtKiYH/kqUhQWV2rgOnbcy9tSQHTtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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