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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'badcd7512aa078a53f290487b21ca937a0c91b99a6a14f76c4398c4a499ea1e0' 
  AND token = 'aEsvxGAxMLegUXsofKfb2mEOz5iOTx74xsWxIWc5cP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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