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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80c1f006eccd1d015a910ab786100cb1e6a2f4201354c61179fd21cf283a89d' 
  AND token = '1JpcDGvVH4Udkojcqgurkw7rd3P2e5Uz7JKOIzPGkQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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