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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b266d554f5a6dbb87c1a60eea2383f27b8e14024322ab1f5bb5b1733ca960f66' 
  AND token = '0NJ56QgmjIoEJnUFA6yQ2ni/UI8tpYUMy+/GzoMW29s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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