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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39ad41462464978d47253cd2059c9d4cddf3b848305410fbc4dcb5ed9beb216' 
  AND token = '1n2BCtPlyEcv1kQIqZ5i+RHelGNB9tnf4DsyIJYQRFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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