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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c2d9c869dbeb38c32dd039ed4c33ac18e8e5e8cea52db3d1446a816694e087' 
  AND token = '3//HjuDkpXRLuBdu7X5LQPPhPfvXY7/4mPEfleEweVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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