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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3c71fdf124c762dfad566d36fed4151bf276743056e0d8a78d918e41e22a6c' 
  AND token = 'LSarliat43ENkQRGg6kh11hCQWPEVEoKNX2f3822H9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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