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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831dbd3fb70b907c14f2225f58788e8e8c7b8a0ecd678e09ae7c68b2c3085d79' 
  AND token = '/591mQYNQst6cAT2jwLKcQD01lDHjVLSPl4YvkMBPFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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