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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4397b7c1500d1a6962387cb7b4af1fd33c835ccc7a392d5caeb097cc9376a662' 
  AND token = 'VogtpdByRmS1mjrxWBe3HofqEUEQ/q/HsHdVx21xDk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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