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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c72c493b7deae7addb25c0d86c9bb2327c65b1951b63157cbc8d35ea61c41872' 
  AND token = 'BVQG1TRDioiX0W7eDxf2QPfS/Qh1Eg/Smha9FoPmTuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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