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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eece0b56cbb041631e0cbe67d1ece39038fa082a4a87571a048dcfaac62d867' 
  AND token = 'SlDX/x1jipOzCh7NAY2RVaPUqA7I2WIewb3wtSnTLAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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