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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32946c0ee932eff76676c8113a564638e2f7acd00a0d9f043d103d523b40056f' 
  AND token = 'eS/+m6UUeyTfRgInzsRjX5OxorEh+VFhICTf8Q4wt/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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