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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21a0e76a12f4bd7e203f63fe596558aa3a4d0dfc951f223d79a4d4137403060e' 
  AND token = 'iHLJflZB5lztSNa3iA3nX55WjcicwU1eNAMw4BdeYAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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