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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c725e617f4e4faa1b82e71bd9ba88bbc9cdae9a3c370ea5ee5536458fdc200c1' 
  AND token = 'IUn5fTPzqAvU042d2BeVpy0tiEMsskbCnKCsd18ZSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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