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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c013a65a7490dee83dac360abde1e06e49bd1d3206f7da3ff165ca170ceb7193' 
  AND token = 'wzxxXku2M7uToi5HqAWIN2/Ha3yCmC0zEgU0SjYXP+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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