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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0f3ae2e85c7ed9cafd97a81bfd85d6b428a381e0dea6fc1f370d0836d3dd8d' 
  AND token = 'eaxCNYNb/2zMGRLqE4idlQVMmv6aIT3Drio53ao0VvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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