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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60be7e2d8f6211a05db6e408e4656a239a6ae00ec49e06a4216200c7c48ce148' 
  AND token = 'VMoJ+emAbeslRt2bc9vf0a3lf9Ph0H/5xvckhnGJX6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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