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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430973dbacd3c814bcef2a839338eeb65ae163a144e97a2f89935e6a86194a69' 
  AND token = '/JTZfD6DTpuV56HmeUxNi71at9PQoMIBUYGs2VYGSZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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