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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cee400995cf386e85e923bc5625f83c3af0594a54f135fcf47e6eaae0f08b23' 
  AND token = 'UJvq/Ad/u5qgqlXS4+onTQx2AmWl4PUO98eeP5xQM5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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